Sync engage-native docs with v1.18.1

[mintlify]

Summary

Syncs documentation for d-sports-engage-native after d-sports-ecosystem/d-sports-engage-native@0a640bc (version bump to 1.18.1, initial repo commit).

Trigger repo changes

• d-sports-engage-native: Initial commit of entire codebase at v1.18.1 with Expo 55, React Native 0.83.4, React 19.2

Doc pages updated

repositories/d-sports-engage-native.mdx

• Updated tech stack versions: Expo 54→55, React Native 0.81→0.83.4, React 19→19.2
• Added new stack entries: OneSignal, Sentry, Vercel Analytics, Reanimated 4
• Added environment variables table listing all EXPO_PUBLIC_* keys
• Expanded features list with widgets, games (pick'em, spin wheel, guess the player), settings
• Replaced plain getting started list with Mintlify Steps component including build commands
• Added crypto checkout backend integration detail

repositories/d-sports-engage-native/architecture.mdx

• Added full project structure tree
• Added routing section with route groups, auth protection, path alias
• Added screen pattern section explaining JSX-only screens + hook extraction
• Added tab bar section with iOS (NativeTabs) vs Android/web (PillTabBar) differences
• Added state management table (Zustand, React Context, hooks)
• Added API client and caching section with domain module list
• Added checkout and payments table (RevenueCat fiat vs Thirdweb crypto)
• Added widgets section (iOS + Android)